Add new terms which can be a useful reference

Terms added are Trimix, Nitrox, Heliox and TC.

Signed-off-by: Gopichand Paturi <gopichandpaturi@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Another small tweak to whitespace tool

clang-format doesn't appear to reindent multi line #define statements
correctly - so this hopefully will clean those up.

The included whitespace corrections to the code should stay in place when
using the updated tool.

This includes cleaning up some multi-line comments that were messed up the
last time around as well as a few other minor changes.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>